@mixin flex_b {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
@mixin flex_a {
    display: flex;
    justify-content: space-around;
    align-items: center
}
@mixin head_fixed{
    position: fixed;
    top: 0;
    background: #ffffff;
    z-index: 1;  //提高优先级，覆盖别的元素
}
body {
    box-sizing: border-box;
    width: vw(750);
    margin:0 auto;
    .main{
         margin-bottom: vw(136);  //消除footer固定导致一部分内容被遮挡的问题
    }
    footer{
        position: fixed;
        bottom: 0;
        width: 100%;
        height: vw(136);
        padding: vw(15) 0;
        background: #ffffff;
        ul{
            display: flex;
            justify-content: space-around;
            li{
                width: vw(73);
                height: vw(110);
                a{
                    display: block;
                    display: flex;
                    flex-direction: column;
                    text-align: center;
                    width: vw(73);
                    height: vw(110);
                    .iconfont{
                        font-size: vw(73);
                        color: #ff9344;
                    }
                    span{
                        font-size: vw(26);
                        color: #000000;
                    }
                }
            }
        }
    }
}
